Low-energy hypernuclear spectra with microscopic particle-rotor model with relativistic point coupling hyperon-nucleon interaction

Original · EN

We extend the microscopic particle-rotor model for hypernuclear low-lying states by including the derivative and tensor coupling terms in the point-coupling nucleon-Λ particle (NΛ) interaction. Taking ¹³ ΛC as an example, we show that a good overall description for excitation spectra is achieved with four sets of effective NΛ interaction. We find that the Λ hyperon binding energy decreases monotonically with increasing the strengths of the high-order interaction terms. In particular, the tensor coupling term decreases the energy splitting between the first 1/2- and 3/2- states and increases the energy splitting between the first 3/2+ and 5/2+ states in ¹³ ΛC.